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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd25a1c62f09c140ce38649592c42e349499c59138b0cf8da68d68b9a19e1f9df' 
  AND token = '9KFY86seU0wQFA9gJs9fDJ0vQkzMjv1DCV+lOk1h09U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}